Vat dyestuffs of the anthraquinone oxazole series



Patented Sept. 15, 1931 FATE a enons kanrscnnn. AND o'r'ro OF DELAWARE BAYER, 0F FRANKFOET-ON-THE-MAIN, GERMANY, AS SIGNOR-S TO GENERAL ANILINE WORKS,

INC., 0E NEW YORK, N. L, A CORPORATION "VAT DYESTUFF$ OF THE ANTHRAQUINONE OXAZOLE SERIES No Drawing. Application filed May 27, 1930, Serial In British Letters Patent No. 198,077 the manufacture of vat dyestuffs is described consisting in condensing anthra-quinone-Q-aldehyde or a substitution product thereof with an o-aminophenol or an o-aminothiophenol. The intensity of the vat dyestufis thus produced is particularly increased by the presence of the amino-group in l-position of the anthraquinone nucleous. In the examples of said specification dyestuffs formed by condensing anthraquinone compounds of the aforesaid kind with ortho-aminophenols, oaminothiophenols and o-o-diamino-dithiophenols are described.

The present invention relates to certain new embodiments of the above mentioned series of dyestufis corresponding probably to the general formula:

quinone-Q-carboxylic acid chloride and 1- aminoanthraquinone-Q-anile.

No. 456,278, and in Germany June 1, 1929.

ing a mixture of the components to elevated temperatures,advantageously in the presence of a suitable diluent with or without the addition of salts acting as condensing agents or by treatment with acid condensing agents such as sulfuric acid or zinc chloride.

WVhen anthraquinone-2-aldehyde or 1- amino-anthraquinone-Q-aldehyde are used as starting materials the formation of azomethines can be detected, which intermediates are converted into the stable dyestuffs by further heating of the reaction mass.

In order to further illustrate our invention the following examples are given, the parts being by weight and all temperatures in centigrade degrees, but it is however to be understood, that our invention is not limited to the particular products nor reacting conditions mentioned therein.

Example 1 23.6 parts of anthraquinone-2-aldehyde are heated with 10.8 parts of 3.3-dihydroXy-b-enzidine in an apparatus provided with a reflux condenser, advantageously with addition of 10 parts of potassium carbonate and about 200parts of nitrobenzene. When the dyestuif formation has been finished the separated dyestuif is isolated by filtration. Preferably it is dissolved in concentrated sulfuric acid, precipitated again with water and the finely divided aqueous paste thus obtained may be treated for purification with an oxidizing agent such as sodium hypochlorite.

The new dyestufi corresponding probably to the formula:

The condensation may be effected by heatis soluble in concentrated sulfuric acid with an orange brown color and dyes cotton from a brownish ol1ve vat full yellowish orange shades of a good fastness.

Example 2 parts of the azomethine, obtained by heating two molecular proportions of anthraquinone-Q-aldehyde with one molecular proportion of 3.3-dihydroxy-benzidine in glacial acetic acid, are mixed with about 60 parts of nitrobenzene and 5 parts of molten sodium acetate and the mixture is heated until no unchanged azomethine. can be detected. The separated dyestufi, which is isolated as described in Example 1, corresponds with that of Example 1 in its properties and tinctorial behaviour.

Example 3 27 parts of anthraquinone-2-carboxylic acid chloride are condensed with 10.8 parts of 3.3-dihydroxy-benzidine and the carboxyamide thus formed is boiled with addition of about 200 parts of nitrobenzene and 10 parts of potassium carbonate in an apparatus provided with a reflux condenser, until the formation of the dyestufi' has been finished. The isolated dyestuif corresponds in its behaviour and in its tinctorial properties with that of Example 1.

Example 4 25 parts of 1-amino-anthraquinone-2-aldehyde are dissolved in about 300 parts of nitrobenzene and at 160 10.8 parts of 3.3-dihydroxy-benzidine are added. Then the reaction water is distilled off and 20 parts of potassium carbonate are added. The mass is 55 heated for about 7 to 8 hours in an apparatus NH: O

I 0 II We claim a0 1. As new compounds vat dyestufi's of the anthraquinone series corresponding probably to the general formula:

wherein X means hydrogen or the aminogroup and Y hydrogen or halogen, which dyestuffs dye the vegetable fiber full orange to bluish red shades of a good fastness.

As new compounds vat dyestuffs of the anthraquinone series corresponding probably tothe general formula:

wherein X means hydrogen or the aminogroup, which dyestuffs dye the vegetable fiber full orange to bluish red shades of a good fastness.

3. As a new compound the vat dyestufl' of the probable formula:

NE: NH] O t which dyestulf dyes the vegetable fiber full bluish red shades of an excellent fastnessto light, chlorine and boiling alkali.

In testimony whereof, We affix our signatures.

GEORG KALISGHER. OTTO BAYER. 

